Features
Ductile iron bearing cap, 117% stronger than gray iron predecessor
O-ring sealing configuration between housing and bearing cap improves clamp load and reduces vibrational effects
80% thicker steel discs in the clutch pack to resist premature tooth wear
Nine speed ratios including low and high speeds
10-bolt mounting aperture for Allison and Caterpillar automatic transmissions
Hydraulic PowerShift (hot-shift) operation supports continuous duty
Wet Spline Lubrication option provides 7 to 10 times greater shaft life
Rotatable cast-iron flanges reduce pump clearance interference
Positive Stop for driveline outputs eliminates oil seal damage from coupling
SmartStart reduces shock load at start-up; Electronic Overspeed Control (EOC) protects driven equipment
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Transmission Application: Allison and Caterpillar automatic transmissions
- Continuous Operation: Yes
- Speed Ratios: Nine (includes low and high speeds)
- Continuous Torque (series rating): 390 lb-ft (529 Nm) - verify actual rating on application page
- Intermittent Torque (series range): 301 to 400 lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 37 HP at 500 RPM, 74 HP at 1,000 RPM
- Lubrication: Pressure Lube with Wet Spline option available
- Output Types: SAE B Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
- Markets: Fire and Rescue, Truck Cranes, Pumper Cleaner, Refuse
Additional Information
Parts manual and diagrams: Chelsea 281 Series PTO parts list with prices
